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Related Experiment Videos

Complex visual disturbances in Alzheimer's disease.

M F Mendez1, M A Mendez, R Martin

  • 1Department of Neurology, University Hospitals of Cleveland, OH.

Neurology
|March 1, 1990
PubMed
Summary

Alzheimer's disease (AD) patients frequently experience complex visual disturbances, impacting object recognition and spatial awareness. These visual impairments correlate with dementia severity and may stem from neuropathology in the brain's visual cortex.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Alzheimer's disease (AD) pathology affects the visual association cortex.
  • Previous research has not systematically explored complex visual disturbances in AD.

Purpose of the Study:

  • To investigate the prevalence and nature of complex visual disturbances in community-based Alzheimer's disease patients.
  • To compare visual task performance between AD patients and healthy controls.

Main Methods:

  • Evaluated 30 AD patients and 30 controls on 7 complex visual tasks.
  • Assessed visual acuity, color recognition, object evaluation, face recognition, spatial localization, and figure analysis.

Main Results:

  • 43% of AD patients reported complex visual complaints.

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  • AD patients showed impairments in evaluating objects, faces, spatial locations, and figures, despite normal visual acuity and color recognition.
  • All AD patients had figure-ground analysis disturbances; 57% experienced visual agnosia.
  • Worse dementia severity correlated with more severe visual disturbances.
  • A subgroup with Balint's syndrome performed poorest on visual tasks.

    • Conclusions:

    • Complex visual disturbances are common in Alzheimer's disease.
    • Findings suggest these visual impairments arise from neuropathology in the visual association cortex.